The magnetostrictive liquid level meter is a kind of magnetostrictive liquid level displacement sensor. A float is provided outside the sensor measuring rod of the magnetostrictive level meter, which can move up and down along the measuring rod as the liquid level changes.
Magnetostrictive level meter is a kind of high precision liquid level measuring instrument, also known as magnetostrictive level displacement sensor.
Its working principle is based on the magnetostrictive effect (also known as the Weidman effect), which uses this physical phenomenon to achieve accurate liquid level measurement.
The magnetostrictive level meter consists of three key components:
Circuit unit: Responsible for generating a current pulse and detecting the returned torsion wave signal.
Float (float) : built-in permanent magnet, with the rise and fall of the measured liquid level and move up and down, forming a static magnetic field.
Probe rod (waveguide or rod) : made of a special magnetostrictive material, used to transmit current pulses and torsional wave signals.
Working principle
Initial pulse: The electronic transmitter periodically sends a short pulse of electric current to the probe rod, which creates a magnetic field inside the probe rod that travels rapidly along the rod.
Magnetic field interaction: The float moves up and down with the rise and fall of the measured liquid level, and the permanent magnet inside the float forms a static magnetic field around it.
When the pulsed magnetic field generated by the transmitter meets the static magnetic field of the float, it causes a magnetostrictive effect at the position where the two interact, resulting in a tiny twist wave (or echo pulse) at that point.
Signal detection: The torsion wave travels back along the probe rod at a fixed ultrasonic speed, and when it reaches one end of the probe rod, the electronic transmitter is able to detect the returned torsion wave signal.
Time measurement: By accurately measuring the time difference between the launch of the initial pulse and the reception of the tortuous wave signal, and then based on the speed of the tortuous wave propagation in the material, the actual distance of the float (and the liquid level) relative to the bottom of the sensor can be calculated, so as to determine the height of the liquid level.
The advantages of using a magnetostrictive level meter for liquid level measurement are as follows:
Strong reliability: Because the magnetostrictive level meter adopts the waveguide principle, there is no mechanical moving part, so there is no friction and no wear. The whole converter is enclosed in stainless steel tube, and the measuring medium is non-contact, the sensor works reliably and has a long life.
High precision: Because the magnetostrictive liquid level meter works with waveguide pulse, the measured displacement is determined by measuring the time of the start pulse and the end pulse, so the measurement accuracy is high, and the resolution is better than 0.01%FS, which is difficult to achieve the accuracy with other sensors.
Good safety: Magnetostrictive level meter has high explosion-proof performance, intrinsic safety and explosion-proof, safe to use, especially suitable for the measurement of chemical raw materials and flammable liquids.
The magnetostrictive level meter is easy to install and maintain: The magnetostrictive level meter is generally installed through the existing pipe port on the top of the tank, especially for the installation of underground storage tanks and storage tanks that have been put into operation, and can be installed without affecting normal production.
Easy to automate the system: the secondary instrument of the magnetostrictive level meter uses the standard output signal, which is convenient for the microcomputer to process the signal, easy to realize the networking work, and improve the automation of the entire measurement system.
Applications: Magnetostrictive level meters are widely used in a variety of industrial level measurements due to their high precision, high stability, high reliability and low sensitivity to environmental changes, including but not limited to:
Petrochemical industry: Used for storage tanks, reactors and pipelines and other equipment level monitoring and control, to ensure the stability and safety of the production process.
Environmental protection water treatment industry: monitor the liquid level of sewage treatment tanks, sedimentation tanks and other equipment to ensure the smooth progress of sewage treatment process.
Food processing industry: Monitor the liquid level in the liquid mixing tank to ensure that the raw materials are mixed in the correct ratio to ensure the quality of the final product.
Other industries: such as pharmaceutical, energy, hydrology, water conservancy, grain processing, brewing and other industries, for various liquid tank level measurement and control
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